Katrina, 51, and Garry Eubanks, 55, from Urbandale Iowa, were in charge of the teenager's care

Airionna Bent was born prematurely and suffers from cerebral palsy and and cannot speak.

She is fed through a tube and her mum Becky Bent-Weible, left her in the care of Katrina, 51, and Garry Eubanks, 55, from Urbandale Iowa, when she turned 18, visiting her weekly.

On May 28 the couple, hired by a company that cares for disabled people, are accused of bathing Airionna in the chemicals causing "severe burns all over her body", KCCI reports.

The Eubanks are alleged to have waited for five days to send her to hospital, and court records show they took her out of state to a hospital in Florida where Katrina's sister-in-law worked as a nurse.

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The had told another colleague about their plans to take her to Florida but the police were informed and Airionna's mum told.

Court documents detailed: "Garry described... how Bent was crying and screaming in pain and that the injuries were so bad that you could see fingerprint impressions on Bent's skin if someone touched her."

When Katrina was arrested she said it had been an accident and claimed she didn't know the teenager's injuries were that bad.